Several Factors Affecting the CNC Processing Technic
Time:2015-04-21 17:19 source:
Leecheer Author: Leecheer Click:
Several factors affecting the CNC processing technic
The geometrical featuresof CNC finished surface includes surface roughness,
surface undulation and veis of surface working. Surface roughness is the
elementary unit to constitute the geometrical characteristic of finished surface.
When workpiece surface is manchined by metal cutting tools, the surface roughness
is affected by geometrical factors, physical factors and machining process
technology.
1. Geometrical factors
Considering the geometrical factor, the shape of tools and geometric angle,
especially the feed of corner radius, tool cutting edge angle, tool minor cutting
edge angle, have great impact on surface roughness.
2. Physical factors
Considering the physical essence of cutting process, the circular bead of cutting
edge and extrusion and friction friction of cutting tools will make plastic deformation
of metallic material, which deteriorate seriously the surface roughness. Cuttings
with banding formed by manchined plastic materials, the front knief face will form
hard and thick built-up edge. The built-up edge will cut instead of front knief face
and cutting edge, which will make changeof geometric angle and back
engagement of the cutting edge of cutting tool. The outline of built-up edge
is irregular so it will make tool marks on the surface of workpieces. Some
built-up edges would inset into workpiece surface, which increase the surface
roughness.
3. Machining process technology
Considering the impact to the surface roughness of workpiece from machining
process technology, the main factors are related with cutting tools , the tecture
of workpiece and the processing conditions.
Keywords: CNC， processing technic，factors
